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404 N Wiget Lane <br /> Sequoia Walnut Cheek,CA 945% <br /> (925)988-9600 <br /> mW Analytical FAX(916)988-9673 <br /> www wguoialabs e <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd,Ste #1100 Project Number Arco#4932 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 03-Jul-02 18 29 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFT- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Motes <br /> Batch 2F20001 -EPA 5030B McOH <br /> Blank(2F20001-BLKI) Prepared 20-Jun-02 Analyzed 21-Jun-02 <br /> Purgeable Hydrocarbons(C6-C 12) ND 10 mg/kg <br /> Benzene ND 00050 " <br /> Toluene ND 00050 " <br /> Ethylbenzene ND 00050 " <br /> Xylenes(total) ND 00050 " <br /> Methyl tert-butyl ether(MTBE) ND 0 050 " <br /> Surrogate a a a-Tri luorotoluene 0 640 0 600 107 40-140 <br /> Blank(2F20001-BLK2) Prepared 25-Jun-02 Analyzed 26-Jun-02 <br /> Purgeable Hydrocarbons(C6-C12) ND 10 mg/kg <br /> Benzene ND 00050 " <br /> Toluene ND 00050 " <br /> Ethylbenzene ND 00050 " <br /> Xylenes(total) ND 00050 <br /> Methyl tent-butyl ether(MTBE) ND 0 050 " <br /> Surrogate a a a-Tnfluorotoluene 0 794 0 600 132 40-140 <br /> LCS(2F20001-BS1) Prepared 20-Jun-02 Analyzed 21-Jun-02 <br /> Benzene 0 686 00050 mg/kg 0 800 85 8 50-150 <br /> Toluene 0 710 00050 0 800 888 50-150 <br /> Ethylbenzene 0 730 00050 0 800 91 2 50-150 <br /> Xylenes(total) 224 00050 240 933 50-150 <br /> Surrogate a a a-Tnfluorotoluene 0 666 0 600 111 40-140 <br /> LCS(2F'20001-BS2) Prepared 25-Jun-02 Analyzed 26-Jun-02 <br /> Benzene 0 746 00050 mg/kg 0 800 93 2 50-150 <br /> Toluene 0 752 00050 0 800 940 50-150 <br /> Ethylbenzene 0 762 00050 0 800 952 50-150 <br /> Xylenes(total) 2 33 00050 240 971 50-150 <br /> Surrogate a a a-Triuorotoluene 0 636 " 0 600 106 40-140 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> r� <br /> Page 4 of 7 <br />